feat: demo deployment with AIUI chat, SSH key auth, Quick Start fix

- Add AIUI pre-built dist to demo/ for Portainer deployment
- Add nginx-demo.conf with Claude API proxy (envsubst for API key)
- Add docker-entrypoint.sh for runtime API key injection
- Update Dockerfile.web to include AIUI and Claude proxy
- Update docker-compose.demo.yml with ANTHROPIC_API_KEY env var
- Switch deploy script from sshpass to SSH key auth
- Fix Quick Start Goals animating before other cards (stagger 5, opacity guard)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

demo/aiui/assets/chunk-FMBD7UC4-Ckq4i3s7.js

@@ -0,0 +1,15 @@
+import{_ as e}from"./mermaid.core-CAd6zjbx.js";var l=e(()=>`
+  /* Font Awesome icon styling - consolidated */
+  .label-icon {
+    display: inline-block;
+    height: 1em;
+    overflow: visible;
+    vertical-align: -0.125em;
+  }
+  
+  .node .label-icon path {
+    fill: currentColor;
+    stroke: revert;
+    stroke-width: revert;
+  }
+`,"getIconStyles");export{l as g};